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106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
#pragma once
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#include <stdbool.h>
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#include <inttypes.h>
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#include <sys/queue.h>
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#include <time.h>
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#include "tamper.h"
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#include "params.h"
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#include "resolver.h"
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#define BACKLOG 10
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#define MAX_EPOLL_EVENTS 64
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#define IP_TRANSPARENT 19 //So that application compiles on OpenWRT
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#define SPLICE_LEN 65536
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#define DEFAULT_MAX_CONN 512
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#define DEFAULT_MAX_ORPHAN_TIME 5
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int event_loop(const int *listen_fd, size_t listen_fd_ct);
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//Three different states of a connection
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enum{
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CONN_UNAVAILABLE=0, // connecting
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CONN_AVAILABLE, // operational
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CONN_RDHUP, // received RDHUP, only sending unsent buffers. more RDHUPs are blocked
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CONN_CLOSED // will be deleted soon
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};
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typedef uint8_t conn_state_t;
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// data in a send_buffer can be sent in several stages
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// pos indicates size of already sent data
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// when pos==len its time to free buffer
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struct send_buffer
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{
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uint8_t *data;
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size_t len,pos;
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int ttl, flags;
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};
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typedef struct send_buffer send_buffer_t;
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enum{
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CONN_TYPE_TRANSPARENT=0,
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CONN_TYPE_SOCKS
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};
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typedef uint8_t conn_type_t;
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struct tproxy_conn
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{
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bool listener; // true - listening socket. false = connecion socket
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bool remote; // false - accepted, true - connected
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int efd; // epoll fd
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int fd;
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int splice_pipe[2];
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conn_state_t state;
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conn_type_t conn_type;
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struct tproxy_conn *partner; // other leg
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time_t orphan_since;
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// socks5 state machine
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enum {
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S_WAIT_HANDSHAKE=0,
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S_WAIT_REQUEST,
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S_WAIT_RESOLVE,
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S_WAIT_CONNECTION,
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S_TCP
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} socks_state;
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uint8_t socks_ver;
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struct resolve_item *socks_ri;
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// these value are used in flow control. we do not use ET (edge triggered) polling
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// if we dont disable notifications they will come endlessly until condition becomes false and will eat all cpu time
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bool bFlowIn,bFlowOut, bFlowInPrev,bFlowOutPrev, bPrevRdhup;
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// total read,write
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uint64_t trd,twr, tnrd;
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// number of epoll_wait events
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unsigned int event_count;
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// connection is either spliced or send/recv
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// spliced connection have pipe buffering but also can have send_buffer's
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// pipe buffer comes first, then send_buffer's from 0 to countof(wr_buf)-1
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// send/recv connection do not have pipe and wr_unsent is meaningless, always 0
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ssize_t wr_unsent; // unsent bytes in the pipe
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// buffer 0 : send before split_pos
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// buffer 1 : send after split_pos
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// buffer 2 : after RDHUP read all and buffer to the partner
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// buffer 3 : after HUP read all and buffer to the partner
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// (2 and 3 should not be filled simultaneously, but who knows what can happen. if we have to refill non-empty buffer its FATAL)
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// all buffers are sent strictly from 0 to countof(wr_buf)-1
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// buffer cannot be sent if there is unsent data in a lower buffer
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struct send_buffer wr_buf[4];
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t_ctrack track;
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//Create the struct which contains ptrs to next/prev element
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TAILQ_ENTRY(tproxy_conn) conn_ptrs;
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};
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typedef struct tproxy_conn tproxy_conn_t;
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//Define the struct tailhead (code in sys/queue.h is quite intuitive)
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//Use tail queue for efficient delete
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TAILQ_HEAD(tailhead, tproxy_conn);
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bool set_socket_buffers(int fd, int rcvbuf, int sndbuf);
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